The director of NASA's Goddard Institute for Space Studies has sent climate change denier Malcolm Roberts a politely worded letter debunking the One Nation senator's claim that climate change data is being manipulated.

Gavin Schmidt personally wrote the letter is response to Senator Roberts' request for information on November 14 about the NASA organisation's global surface temperature change analysis (GISTEMP).

In the letter, dated November 18 and circulated on social media by the University of Melbourne's Australian-German Climate & Energy College, Dr Schmidt directed the senator to a number of links on the NASA website which published the entirety of the US space organisation's raw data and the code used to analyse that data.

"You appear to hold a number of misconceptions which I am happy to clarify at this time," Dr Schmdit wrote.

The first "misconception" the agency head addressed related to a graph the prominent climate change denier included in his request for information.

Dr Schmidt pointed out the graph originated from the Global Historical Climatology Network (GHCN), a project run by the US National Ocean and Atmospheric Administration (NOAA).

"Perhaps you might not be aware, but NOAA is a different US Government agency than NASA, and questions relating to their activities or products might be more usefully addressed to them."